Abming device



Aug. 3l, 1948. H, H, PORTER 2,448,121

ARMING DEVICE Filed Dec. 12, 1946 lll! Al! HENRY -H-I:'DRTER 35 WMQMM.,

jectile but sidewise with respect to its own axis and thereby moves into recess 6 which islocated rearwardly therefrom with respect to the direction of acceleration of the projectile. Simultaneously,

H centrifugal force tends to force the tip portion I1 A outwardly but this movement or full retraction is prevented when the end of the plunger lodges against the beveled shoulder l. When the projectile leaves the gun and acceleration ceases, the force of spring 20 against collar I6 pushes the collar back again flat against flange 9 thereby returning the shank I5 to its former axial relation with respect to the detent assembly and into alignment with passage thereby clearing shoulder '1. By the time that this has happened the projectile has reached its full rotational speed, hence the centrifugal force resulting therefrom and acting along the axis of the detent assembly, forces the plunger outwardly against the resistance of spring 2U, the beveled face of the shank portion i5 of the plunger Ill sliding up the beveled shoulder 1 and moving through the cylindrical passage 4 and the tip portion Il withdrawing from the socket 26 in the interrupter gate 2l thus leaving the projectile free to arm by rotation of the gate about pin 3 clear of the path of pin It is obvious that the degrees of taper of the frusto-conical tip Il and the collar iii of the plunger I4 are governed by the clearance required as a result of the'tilting motion during acceleration.

It is thus apparent that this invention provides a detent which will remain in locking position during the set-back or accelerating period of a projectiles travel but which will thereafter be released by the action vof the'centrifugal force of the projectile thereby permitting the fuze to arm after leaving the gun.

It is to be understood that the form of my invention, herewith shown and describedjs to be taken as a preferred example of the same, and that various changes in the shape, size and arrangement of parts may be resorted to,4 without departing from the spirit of my invention, or the scope of the subjoined claims.

l'. claim:

1. An arming device for a rotating projectile having an internal ring train comprising in combination, a housing having a cylindrical open-v ing therethrough, said housing being adapted for installation in a projectile with the axis of said cylindrical opening in radial relation with respect to the projectile, the inner end thereof being adjacent the ring train, a plunger slidably engaged in said cylinder opening, a spring engagingV and maintaining said plunger in a normal position axially coincident within said cylindrical opening and projecting from said housing radially inward toward the axis of rotation of the projectile and into engagement with the ring train, said plunger being adapted to secure the ring train in inoperative relation in the projectile, said housing having an arcuate recess adjoining and axially displaced from said cylindrical opening, said recess being rearwardly displaced with respect to the projectile, said recess being terminated by a shoulder at the end of said recess toward the center of the projectile,

spectto the ing adjacent the firing train,

4 said plunger being constructed and arranged to be tilted into said recess by the linear acceleration of the projectile and engage said shoulder, said shoulder restraining said plunger from radially outward movement during said linear acceleration, said spring returning said plunger to a position axially Ycoincident withsaid passage at the vtermination of saidlinear acceleration in which position said plunger is free to retract 1under the centrifugal force of the rotating projectile thereby disengaging the firing train.

V2. An arming device for a rotating projectile having an internal iiring train comprising in combination, a housing having a cylindrical opening therethrough, said housing being adapted for installation in a projectile with the axis of said cylindrical opening in radial relation with reprojectile, the inner end thereof besaid cylindrical opening consisting of a chamber portion anda reduced diameter passageway in coaxial relation with each other, said passageway opening through the outer end of said housing, a plunger slidably engaged in said cylindrical opening, said plunger having a tip portion, and a shank portion, a spring engaging and maintaining said plunger in a normal position in said cylindrical passage with said shank portion in axial alignment with said reduced diameter passageway and with said tip portion projecting from said housing radially inward toward the axis of rotation of the projectile into engagement with the ring train, thereby securing the ring train in inoperative relation in the projectile, said housing having an arcuate recess adjoining and axially displaced from said passageway, said recess being rearwardly displaced with respect to the projectile, said recess being terminated by a shoulder at the outer end of said recess,`said plunger being constructed and arranged to be tilted into said recess by the linear acceleration of the projectile and engage said shoulder, said shoulder restraining said plunger from radially retracting during said linear acceleration, said spring returning said plunger to a position axially coincident withsaid passage at the termination of said linear acceleration, in which position said plunger is free to retract under the centrifugal `force of the rotating projectile thereby disenand adapted to secure said housing with saidV oiset recess rearward with respect to the longitudinal axis of the projectile, a plunger having a shank portion slidably engageable in said outer passage, a frustro-conical tip portion insertable through said inner passage and a collar portion therebetween of greater diameter than said inner passagefsaid plunger being slidably engaged in coaxial relation within said housing' with said tip portion protruding from said forward end portion thereof and adapted to engage the ring train of the projectile, `and a spring engaged be- REFERENCES CITED The following references are of record in the file of this patent:

Number 5 1,689,470 1,715,513

10 Number UNITED STATES PATENTS Name Date Adelman Oct. 30, 1928 Rogers June 4, 1929 FOREIGN PATENTS Country Date Switzerland May 1, 1933 

